This is a simple wrist watch DIY kit for electronics hobbyists. Anyone with basic soldering experience can build the kit. This is a copy of Solder:Time watch kit from It uses DS1302 clock chip.The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator.


  • It is easy to assemble.
  • The watchband is replaceable.
  • With the transparent acrylic cover, you can see the inside parts clearly.
  • Equipped with some nuts, screws and other electronic components for you to do it by yourself.
  • Watch the images below for assembling the kit. You can see the images on Flickr also.


  • Material: PCB + Electronic Components
  • Color: Green/Blue/Black/Yellow/Pink(Optional)
  • Display: Digital
  • Working Voltage: 3V
  • Power Supply: CR2025 button battery (not included)
  • Clock Regulating Mode: Button adjustment
  • Display Mode: Red LED digital tube display
  • Energy Saving: Light for 5 seconds then change to power saving mode automatically
  • Water-resistant Level: Not water-resistant
  • Dial Diameter: Approx. 5.4cm / 2.13in
  • Dial Thickness: Approx. 1.6cm / 0.63in
  • Watchband Length: Approx. 25cm / 9.84in
  • Watchband Width: Approx. 2cm / 0.79in
  • Item Weight: Approx. 47g / 1.63oz
  • Package Weight: Approx. 48g / 1.70oz

To check the time:

  • • On the right side of the Solder : Time, press button once and release.
  • • Current time will display and after ~ five seconds display will go to sleep

To set the time:

  • • Press the button twice and hold it.
  • • After about five seconds the time will start to advance and the colon will flash to show that you are in time setting mode.
  • • After about ten seconds of slow time advancement, the time advancement will go into a fast forward mode.
  • • If the button is released the colon will continue to flash (time setting mode is still active).
  • • If the button is not pressed again for around five seconds the watch will go to sleep. The next time it wakes up it will be in normal time display mode.
  • • If the button is pressed again before the watch goes to sleep, the slow advance is restarted.

See the other images also